Barbados Trench fault zone heterogeneity detected from variations in amplitude of the decollement. Modeling and logging density (red curves from ODP Leg 156 and 171A) indicate that this reflection response is from a thin layer of low density/seismic velocity maintained by high pressure fluids within the fault zone. The relatively small regions of positive-polarity (orange) waveforms, are drained areas of the fault, and possibly areas of enhanced fault strength (Shipley et al., 1994; Bangs et al., 1996). Calibrations of the waveforms to the well log data will allow quantitative mapping of velocity/density variation along the fault plane. This perspective figure displays a 3.9 km crossline and 6 km inline seismic section from the 5 km x 25 km survey area. Figure and caption by Tom Shipley.

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